Should I break up with him?

Me and my boyfriend have been dating for a few months he has been blackmailing me and started a psychical fight with my friends at a formal event but he has helped me through my anorexia and is someone I had liked for over a year we're not happy but we still have feelings for each other he can be funny sweet and understanding but it's just exhausting should I try and fix it or dump him?
Should I break up with him?
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